Method for fixing chromated copper arsenate treating agents in wood

Abstract

A method for fixing chromated copper arsenate agents in wood by treating the wood with a fixing agent selected from the following: ##STR1## wherein R 1 is the same or different and is hydrogen, phenyl or an alkyl group having 1 to 4 carbon atoms, R 2 is hydrogen or an alkyl group having 1 to 4 carbon atoms and R 3 is (R 4 ) 2 (HO)C-- or R 4 OOC-- and R 4 is hydrogen, an alkyl group having 1 to 4 carbon atoms, phenyl or pyridyl.

What is claimed is: 
     
       1. A method for fixing chromated copper arsenate agents in wood comprising the steps of impregnating the wood with chromated copper arsenate; and treating the chromated copper arsenate impregnated wood with a fixative agent selected from the group consisting of compounds having the formula ##STR4## and salts thereof, wherein R 1  is the same or different and is selected from the group consisting of hydrogen, phenyl or an alkyl group having 1 to about 4 carbon atoms, R 2  is selected from the group consisting of hydrogen and an alkyl group having from 1 to about 4 carbon atoms and R 3  selected from the group consisting of (R 4 ) 2  (HO)C-- and R 4  OOC-- wherein R 4  is selected from the group consisting of hydrogen, an alkyl group having 1 to about 4 carbon atoms, phenyl and pyridyl. 
     
     
       2. The method of claim 1 wherein the wood is treated with hydrazine. 
     
     
       3. The method of claim 1 wherein the wood is treated with alpha-hydroxylamine. 
     
     
       4. The method of claim 1 wherein the wood is treated with beta-hydroxylamine. 
     
     
       5. The method of claim 1 wherein the wood is treated with oxalic acid. 
     
     
       6. The method of claim 1 wherein the wood is treated with glycolic acid. 
     
     
       7. A method for fixing chromated copper arsenate agents in wood comprising the steps of impregnating the wood with chromated copper arsenate; treating the chromated copper arsenate impregnated wood with a fixative agent selected from the group consisting of compounds having the formula ##STR5## and salts thereof, wherein R 1  is the same or different and is selected from the group consisting of hydrogen, phenyl or an alkyl group having 1 to about 4 carbon atoms, R 2  is selected from the group consisting of hydrogen and an alkyl group having from 1 to about 4 carbon atoms and R 3  is selected from the group consisting of (R 4 ) 2  (HO)C-- and R 4  OOC-- wherein R 4  is selected from the group consisting of hydrogen, an alkyl group having 1 to about 4 carbon atoms, phenyl and pyridyl; and employing picolinic acid as said fixative agent in treating the chromated copper arsenate impregnated wood. 
     
     
       8. The method of claim 1 wherein the wood is treated with 2-hydroxy-2-methylbutyric acid. 
     
     
       9. A method for fixing chromated copper arsenate agents in wood comprising the steps of impregnating the wood with chromated copper arsenate; treating the chromated copper arsenate impregnated wood with a fixative agent selected from the group consisting of compounds having the formula ##STR6## and salts thereof, wherein R 1  is the same or different and is selected from the group consisting of hydrogen, phenyl or an alkyl group having 1 to about 4 carbon atoms, R 2  is selected from the group consisting of hydrogen and an alkyl group having from 1 to about 4 carbon atoms and R 3  is selected from the group consisting of (R 4 ) 2  (HO)C-- and R 4  OOC-- wherein R 4  is selected from the group consisting of hydrogen, an alkyl group having 1 to about 4 carbon atoms, phenyl and pyridyl; and employing mandelic acid as said fixative agent in treating the chromated copper arsenate impregnated wood. 
     
     
       10. The method of claim 1 wherein the fixative agent is contained in an aqueous solution. 
     
     
       11. The method of claim 10 wherein the fixative agent is in the aqueous solution in a concentration of from about 0.5 to about 4.0 percent by weight. 
     
     
       12. A method for fixing chromated copper arsenate agents in wood comprising the steps of impregnating the wood with chromated copper arsenate; treating the chromated copper arsenate impregnated wood with a fixative agent selected from the group consisting of compounds having the formula ##STR7## and salts thereof, wherein R 1  is the same or different and is selected from the group consisting of hydrogen, phenyl or an alkyl group having 1 to about 4 carbon atoms, R 2  is selected from the group consisting of hydrogen and an alkyl group having from 1 to about 4 carbon atoms and R 3  is selected from the group consisting of (R 4 ) 2  (HO)C-- and R 4  OOC-- wherein R 4  is selected from the group consisting of hydrogen, an alkyl group having 1 to about 4 carbon atoms, phenyl and pyridyl, and wherein the fixative agent is contained in an aqueous solution; and treating the wood by a modified full cell treating cycle with the aqueous solution containing the fixative agent after the wood has been treated with the chromated copper arsenate agent.